Sandpaper drum



o. E. HADWIGER ET AL 145,980

SANDPAPER DRUM Filed March 4, 1938 if adchrmigi IN VEN TOR.

BY M,

A TTORNEYS.

Patented Feb. 7, 1939 UNITED STATES PATENT OFFICE SANDPAPER D-RUM Application March 4, 1938, Serial No. 193,988

2 Claims.

This invention relates to sand drums, the primary object of the invention being to provide a sand drum of a construction to insure the sand cloth being firmly held in position on the drum 5 and one in which the sand cloth will be stretched over the drum, providing an even sanding surface.

A further object of the invention is to provide a drum which will cushion the sanding surface of the drum, thereby greatly increasing the life of 10 the sand cloth. A still further object of the invention is to provide a sand drum wherein the sand cloth may be readily positioned, the clamping of the sand cloth being incident to the securing of the drum sections together.

15 Referring to the drawing in detail,

Figure 1 is an elevational view of a sand drum constructed in accordance with the invention.

Figure 2 is a longitudinal sectional View through the sand drum.

20 Figure 3 is a transverse sectional view taken on line 3-3 of Figure 2.

Figure 4 is a transverse sectional view taken on line 4-4 of Figure 2.

Referring to the drawing in detail, the sand 25 drum comprises a body portion including semicylindrical sections 5 and 6, each section being provided with end members 1, which are formedwith openings to receive the supporting shaft 8 which is secured in position, by means of bolts 9 30 extending through the section 5, and disposed near the ends thereof, and the screw I disposed substantially intermediate the ends of the section 5.

The sections and 6 are hingedly connected, as

35 at ll, so that the sections may be pivoted with respect to each other, and swung open, to facilitate the positioning of the sand paper, indicated by the reference character l2.

An opening is formed substantially intermedico ate the ends of the section 6, and is designed to accommodate the screw l3, which has its threaded end fitted in the threaded opening 14, disposed intermediate the end of the supporting shaft 8. Thus it will be seen that due to this construction,

45 the sections may be moved together, and held in such position, by means of the screw l3.

As clearly shown by Figure 3 of the drawing, the sections of the body portion carry a plurality of pins I5, which are adapted to extend into 50 recesses or openings formed in the opposite section, and disposed directly opposite to the pins when the sections are moved to their closed positions.

The outer surface of the drum is covered by a 55 layer of sponge rubber indicated by the reference character IS, the ends of the layer of sponge rubber l6 terminating at points adjacent to the free edges of the semi-cylindrical sections 5 and 6.

As shown, the sand paper I2 is stretched over the layer of sponge rubber IS, the ends of the sand 6 paper being pressed over the pins 15, securing the ends of the sand paper in position.

It will be seen that when the sections 5 and 6 are moved to their open positions, or to positions where the free edges thereof lie in spaced relation 10 with respect to each other, the layer of sponge rubber becomes compressed, at points adjacent to the pivots of the sections 5 and 6, to the end that the sand paper may be readily stretched thereover with little exertion and trouble on the part of the person positioning the sand paper.

When the sections 5 and 6 are moved to their closed positions, and secured in such position by means of the securing screw l3, the inwardly turned ends of the sand paper I2 will be clamped between the adjacent edges of the sections 5 and 6, securely holding the sand paper in position.

A counterbalancing weight indicated by the ref erence character I! is secured within the section 5, at a point adjacent to the inwardly extended ends of the sand paper.

From the foregoing it will be seen that due tothe construction shown and described, we have provided a sand drum which will permit the sand paper to be readily and easily positioned, and at the same time will insure a regular surface for contact With the surface being sanded.

It might be further stated that the free edges of the sections 5 and 6 are cut at oblique angles with respect to the ends thereof, with the result that the sand drum will operate with less chance of the cloth buckling or creeping, and at the same time insure a smooth surface being formed by the sand drum.

Having thus described the invention, what is claimed is:

1. A sand drum comprising a pair of pivotally connected semi-cylindrical sections, pins extending from one of the sections, a strip of sanding cloth having openings at its ends through which the pins extend, the ends of the sanding cloth being clamped between the free edges of the semicylindrical section, a shaft extending through the drum and having threaded openings formed therein, screws extending through the cylinder, the inner ends of the screws extending into the threaded openings of the shaft, and said screws adapted to draw the sections of the drum together tensioning the sand cloth.

2. A sand drum comprising a pair of pivotally connected semi-cylindrical sections, a cushioning member on the drum, a shaft on which the drum is mounted, screws extending through one of the sections of the drum near the ends thereof for securing one of said sections to the shaft, screws extending through both sections and extending into the shaft securing the drum to the shaft, a.

length of sand cloth positioned on the drum, the ends of the sand cloth being clamped between the ends of the sections of the drum, and the latter screws adapted to tension the sand cloth.

OSCAR E. HADWIGER. HARRY o. SCHMIDT. 

